Allow users to set Kaleido path via environment variable #411

Job	Run time
Rustfmt	14s
Tests (ubuntu-latest)	2m 12s
Build Wasm Examples (wasm-yew-minimal)	47s
Tests (windows-latest)	3m 39s
Build Examples (3d_charts)	23s
Clippy	2m 59s
Tests (macos-latest)	9m 43s
Build Examples (basic_charts)	26s
Code Coverage	1m 58s
Build Examples (custom_controls)	24s
Build Examples (financial_charts)	25s
semver	35s
Build Examples (images)	36s
Build Examples (kaleido)	1m 33s
Build Examples (maps)	22s
Build Examples (ndarray)	32s
Build Examples (scientific_charts)	22s
Build Examples (shapes)	24s
Build Examples (subplots)	21s
	27m 55s

Provide feedback